Hello and welcome to Healthcare magic. So as far as I can see, you seem to have thoughts and symptoms of severe anxiety that come on and off. Do you have other symptoms like drying of mouth, sweating and increased heart rate those times? Bupron and clonazepam are good medicines which will bring down your problem with regular review from your psychiatrist and follow up. There is nothing in you that you should be extremely worried of. Anxiety symptoms are very common in young and middle aged people. Maintain good food, adequate hydration, ensure sleep hygiene, and do some relaxation techniques for improvement. Stay away from alcohol and nicotine. I would recommend you to continue your treatment from a qualified psychiatrist with regular follow up. Hope I have answered your queries. Feel free to write if you need further clarifications. Get well soon.